adhoc(false) causes query_context to be ignored. shows queryContext in error message

The error indicates that there was not query_context parameter on the call.
The error messages shows queryContext (instead of query_context) in the error message (although this might just be from toString(), and not indicate what was actually sent to the server). 

com.couchbase.client.core.error.IndexFailureException: The server reported an issue with the underlying index
{"completed":true,"coreId":"0xb9aad4a000000003","errors":[

{"code":12003,"message":"Keyspace not found in CB datastore: default:_default - cause: No bucket named _default"}

],"idempotent":true,"lastDispatchedFrom":"10.144.210.1:63549","lastDispatchedTo":"10.144.210.101:8093","requestId":68,"requestType":"QueryRequest","retried":0,"service":{"operationId":"4426bfd0-8042-47fa-9d10-81882175c579","queryContext":"`default`:`my_bucket`._default","statement":"PREPARE select * from `_default` where META().id >= 'a3ff4660-99de-43a2-bf6f-452408cbffc6'","type":"query"},"timeoutMs":75000,"timings":{"dispatchMicros":52544,"totalMicros":57574}}